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9 Glossary
9.1 Technical terms
Class D, Class III see equipment protection
DC/DC Booster Circuit technology to boost the direct voltage on
a higher voltage level
Equipment protection Technology term of the surge voltage protection:
the conventional surge voltage protection consists
of a lightning current protection (class B, class I), a
surge voltage protection (class C, class II) and an
equipment protection (class D, class III) – see also
e.g. http://www.phoenixcontact.de (topic „TRABTECH“)
IGBT I
nsulated Gate Bipolar Transistor
The latest design of high-performance transistors
with minimum control power requirement (MOSFET
structure) and minimum losses on the output side
(structure of a bipolar transistor)
LED L
ight Emitting Diode
Electronic semiconductor component, commonly
called light diode. Used for optical signalling.
PFC P
ower Factor Correction
Circuit technology for sine-wave input current;
less mains distortion (important for non linear loads)
PWM P
ulse Width Modulation
Here: Circuit technology for generating a sinusoidal
voltage of the highest quality from an existing DC
voltage
SNMP Simple Network Management Protocol
common protocol in networks to manage / control
appliances
VFD Output V
oltage and Frequency Dependent from
mains supply
The UPS output depends of mains voltage and
frequency variations. Former notation: OFFLINE
VI Output V
oltage Independent from mains supply
The UPS output is independent of mains voltage
and frequency variations. The mains voltage
however is rectified by electronic / passive voltage
regulators. Former notation: LINE-INTERACTIVE
VFI Output
Voltage and Frequency Independent from
mains supply
The UPS output is independent of mains voltage
and frequency variations. Former notation: ONLINE
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